A hydraulic control system for an electromechanical coupler and a control method thereof

Abstract

The present invention provides an electromechanical coupler hydraulic control system and a control method thereof, the system comprising a first oil pump, a second oil pump, a controller, a cooling lubricating oil circuit, a clutch control oil circuit and a pilot control oil circuit; the cooling lubricating oil circuit comprises a plurality of pipelines and a cooler, the oil inlet of the cooler is connected to the first oil pump through a first pipeline, and the oil outlet of the cooler is respectively connected to the generator, the motor and the clutch through pipelines; the first oil pump and the second oil pump are respectively connected to the oil tank; the pilot control oil circuit comprises a decoupling reversing valve and a first pilot solenoid valve connected through pipelines, and the decoupling reversing valve is connected to the cooler through a second pipeline; the clutch control oil circuit comprises a third pipeline and a fourth pipeline; the oil outlet of the second oil pump is connected to the decoupling reversing valve through the third pipeline in one way, and connected to the clutch through the fourth pipeline in the other way; the controller is respectively connected to the first oil pump, the second oil pump and the first pilot solenoid valve. The system is used to implement the method. The present invention realizes the good control performance, efficiency and component cost of the electromechanical coupler control system in the vehicle power mode switching.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid vehicle control, and in particular to an electromechanical coupler hydraulic control system and a control method thereof. Background Art

[0002] As fuel consumption and emission standards become increasingly stringent, reducing fuel consumption has become the research and development focus of various automobile manufacturers. New energy vehicles reduce environmental pollution and can effectively improve the overall efficiency of automobile power according to different working conditions, adapting to the policy requirements of energy conservation and emission reduction. Hybrid vehicles use engines and drive motors as power sources, which can achieve pure electric drive at low speeds and parallel drive at high speeds, effectively reducing fuel consumption and emissions, and also providing the power required by vehicles.

[0003] The clutch engagement of hybrid vehicles is achieved through an electromechanical coupling control system. The clutch needs to be engaged when the vehicle enters parallel drive. The timeliness and stability of clutch engagement directly affect the power of the automatic transmission and the comfort of the vehicle. Good clutch control can also greatly improve the overall efficiency of the automatic transmission. The clutch engagement and disengagement use hydraulic drive. When the vehicle power mode is switched, the working mode of the hydraulic control system needs to change. Maintaining good control performance, efficiency and component cost of the electromechanical coupling control system during mode switching is a key technical issue. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an electromechanical coupler hydraulic control system and a control method thereof, so as to maintain good control performance, efficiency and component cost of the electromechanical coupler control system during vehicle power mode switching.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides an electromechanical coupler hydraulic control system, characterized in that it includes a first oil pump, a second oil pump, a controller, a cooling and lubricating oil circuit, a clutch control oil circuit and a pilot control oil circuit;

[0006] The cooling lubricating oil circuit includes a plurality of pipelines and a cooler, the oil inlet of the cooler is connected to the first oil pump through a first pipeline, and the oil outlet of the cooler is connected to the generator, the motor and the clutch through pipelines respectively;

[0007] The first oil pump and the second oil pump are respectively connected to the oil tank;

[0008] The pilot control oil circuit includes a decoupling reversing valve and a first pilot solenoid valve connected by a pipeline, and the decoupling reversing valve is connected to the cooler through a second pipeline;

[0009] The clutch control oil circuit includes a third pipeline and a fourth pipeline; the oil outlet of the second oil pump is connected to the decoupling reversing valve through the third pipeline in one way, and connected to the clutch through the fourth pipeline in the other way;

[0010] The controller is respectively connected to the first oil pump, the second oil pump and the first pilot solenoid valve;

[0011] The first oil pump is used to pump the oil to the cooler and transport the oil to the generator, motor and clutch through pipelines after being cooled by the cooler; the controller is used to control the first pilot solenoid valve to drive the decoupling commutator to reverse according to the current vehicle operation mode to achieve decoupling and coupling of the cooling lubricating oil circuit and the clutch control oil circuit; the second oil pump is used to pump the oil to the cooler through the cooling lubricating oil circuit when coupling or to pump the oil to the clutch through the clutch control oil circuit when decoupling.

[0012] Wherein, the first oil pump is an electronic oil pump, and the cooling and lubricating oil circuit also includes a first one-way valve arranged on the first pipeline.

[0013] Wherein, the second oil pump is a mechanical oil pump, the clutch control oil circuit further includes a second one-way valve arranged on the third pipeline, and the third pipeline is connected to the fourth pipeline.

[0014] The cooling lubricating oil circuit further includes a cooling flow control valve disposed between the generator and the cooler, and the cooling flow control valve is also connected to the pipeline between the second oil pump and the second one-way valve through a fifth pipeline.

[0015] Wherein, the clutch control oil circuit also includes a clutch reversing valve, and a second pilot solenoid valve, one or more pressure sensors, a control oil circuit pressure reducing valve and a main oil circuit regulating valve respectively connected to the controller;

[0016] The clutch reversing valve is arranged on the fourth pipeline; the clutch reversing valve is also connected to the second pilot solenoid valve through a pipeline, and the second pilot solenoid valve is also connected to the first pilot solenoid valve through a sixth pipeline and to the control oil circuit pressure reducing valve through a seventh pipeline, and the sixth pipeline and the seventh pipeline are connected; the control oil circuit pressure reducing valve is also connected to the third pipeline through an eighth pipeline, and a pipeline is led out from the eighth pipeline to connect the main oil circuit regulating valve, and the main oil circuit regulating valve is also connected to the second pipeline through a ninth pipeline; the one or more pressure sensors are arranged on the pipeline of the clutch control oil circuit.

[0017] Wherein, the clutch control oil circuit includes a first pressure sensor and a second pressure sensor, the first pressure sensor is arranged on the fourth pipeline, and the second pressure sensor is arranged on the eighth pipeline.

[0018] Wherein, an overflow valve connected to the controller is arranged on the first pipeline, and the overflow valve is used to adjust the pressure of the cooling lubricating oil circuit.

[0019] Wherein, the eighth pipeline is also provided with a safety valve connected to the controller, and the safety valve is used to release pressure when the oil pressure of the clutch control oil circuit exceeds a preset threshold.

[0020] In order to solve the above technical problems, an embodiment of the present invention further provides a control method of the electromechanical coupler hydraulic control system, comprising the following steps:

[0021] Get the current operating mode of the vehicle;

[0022] If the current running mode of the vehicle is pure electric or extended range mode, the controller controls the first pilot solenoid valve to lose power and drive the decoupling reversing valve core to be in the right position normal working state, the cooling lubrication oil circuit and the clutch control oil circuit are coupled, the oil output by the first oil pump is sent to the cooler for cooling and then sent to the generator, motor and clutch, and the oil output by the second oil pump enters the cooler through the decoupling valve for cooling and then sent to the generator, motor and clutch;

[0023] If the current operating mode of the vehicle is the hybrid mode, the controller controls the first pilot solenoid valve to be energized to drive the decoupling reversing valve core to be in the left position normal working state, the cooling lubrication oil circuit and the clutch control oil circuit are decoupled, the oil output by the first oil pump is sent to the cooler for cooling and then to the generator, motor and clutch, and the oil output by the second oil pump is sent to the clutch via the decoupling valve and the clutch control oil circuit in sequence.

[0024] In order to solve the above technical problems, an embodiment of the present invention also provides another control method of the electromechanical coupler hydraulic control system, comprising the following steps:

[0025] Get the current operating mode of the vehicle;

[0026] If the current running mode of the vehicle is pure electric or extended range mode, the controller controls the first pilot solenoid valve to lose power and drive the decoupling reversing valve core to be in the right position normal working state, the cooling lubrication oil circuit and the clutch control oil circuit are coupled, the oil output by the first oil pump is sent to the cooler for cooling and then sent to the generator, motor and clutch, and the oil output by the second oil pump enters the cooler through the decoupling valve for cooling and then sent to the generator, motor and clutch;

[0027] If the current operating mode of the vehicle is the hybrid mode, the controller controls the first pilot solenoid valve to be energized to drive the decoupling reversing valve core to be in the left position working normal state, the cooling lubricating oil circuit and the clutch control oil circuit are decoupled, and the oil output by the first oil pump is sent to the cooler for cooling and then to the generator, motor and clutch; the controller controls the second pilot solenoid valve to drive the clutch reversing valve to open, and the oil output by the second oil pump is sent to the clutch in turn through the decoupling valve, the clutch reversing valve and the corresponding pipeline; wherein, the pressure sensor detects the pressure parameter of the clutch control oil circuit in real time, and when the pressure parameter is greater than the preset value, the excess oil in the clutch control oil circuit flows out through the main oil circuit regulating valve and merges into the cooling lubricating oil circuit.

[0028] The method further includes the following steps: if the current operating mode of the vehicle is a hybrid mode, increasing the oil flow rate of the cooling lubrication oil circuit during the clutch engagement time.

[0029] Wherein, the method further includes the following steps: if the current vehicle is in pure electric mode, closing the cooling flow control valve; if the current vehicle is in extended-range or hybrid mode, opening the cooling flow control valve.

[0030] The above technical solution has at least the following beneficial effects:

[0031] The above technical scheme proposes an electromechanical coupler hydraulic control system and a control method thereof. The control system and the control method thereof realize coupling or decoupling of the cooling lubricating oil circuit and the clutch control oil circuit by setting a decoupling reversing valve and controlling the decoupling reversing valve to perform reversing through a first pilot solenoid valve, that is, connecting or disconnecting the cooling lubricating oil circuit and the clutch control oil circuit, so that the oil volume at the oil outlet of the second oil pump on the high-pressure side can be delivered to the cooler for cooling in pure electric or extended-range mode and then delivered to the generator, motor and clutch, thereby reducing the requirements for the first oil pump on the low-pressure side and greatly improving the service life of the hydraulic system and the transmission efficiency of the whole machine. Other beneficial effects not mentioned will be further explained below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a structural diagram of a hydraulic control system of an electromechanical coupler described in Embodiment 1 of the present invention.

[0034] Figure 2 This is a flow chart of a control method of an electromechanical coupler hydraulic control system described in Embodiment 2 of the present invention.

[0035] Reference numerals:

[0036] Generator-E1, motor-E2, clutch-E3;

[0037] First oil pump-1, second oil pump-2, cooler-3, decoupling reversing valve-4, first pilot solenoid valve-5, first check valve-6, second check valve-7, cooling flow control valve-8, clutch reversing valve-9, second pilot solenoid valve-10, first pressure sensor 11, second pressure sensor-12, control oil circuit pressure reducing valve-13, main oil circuit regulating valve-14, overflow valve-15, safety valve-16;

[0038] The first pipeline-P1, the second pipeline-P2, the third pipeline-P3, the fourth pipeline-P4, the fifth pipeline-P5, the sixth pipeline-P6, the seventh pipeline-P7, the eighth pipeline-P8, and the ninth pipeline-P9. DETAILED DESCRIPTION

[0039] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0040] In addition, in order to better illustrate the present invention, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present invention can also be implemented without certain specific details. In some examples, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present invention.

[0041] like Figure 1 As shown in the first embodiment of the present invention, an electromechanical coupler hydraulic control system suitable for hybrid electric vehicles is provided, which can be specifically applied to the electromechanical coupling gearbox of hybrid electric vehicles. The hydraulic control system includes a first oil pump 1, a second oil pump 2, a controller, a cooling lubricating oil circuit, a clutch control oil circuit and a pilot control oil circuit; wherein, the generator E1, the motor E2 and the clutch E3 of the vehicle will generate heat during driving, and therefore need to be cooled in time, and the cooling lubricating oil circuit is used to provide cooling lubricating oil for cooling and lubricating the generator E1, the motor E2 and the clutch E3, etc., and the clutch control oil circuit is used to provide oil flow to the clutch E3 when the clutch is engaged, and realize the engagement control of the clutch E3, the first oil pump 1 is a low-pressure oil pump, and the second oil pump 2 is a high-pressure oil pump. It should be noted that the high pressure and low pressure referred to here are only the relative pressures of the two oil pumps.

[0042] The controller is connected to the first oil pump 1 , the second oil pump 2 and the first pilot solenoid valve 5 respectively.

[0043] In this embodiment, the cooling lubricating oil circuit includes several pipelines and a cooler 3, the oil inlet of the cooler 3 is connected to the first oil pump 1 through a first pipeline P1, and the oil outlet of the cooler 3 is connected to the generator E1, the motor E2 and the clutch through pipelines respectively.

[0044] In this embodiment, the first oil pump 1 and the second oil pump 2 are respectively connected to an oil tank, and the oil tank stores oil;

[0045] The pilot control oil circuit includes a decoupling reversing valve 4 and a first pilot solenoid valve 5 connected by pipelines, and the decoupling reversing valve 4 is connected to the cooler 3 through a second pipeline P2; the clutch control oil circuit includes a third pipeline P3 and a fourth pipeline P4; the oil outlet of the second oil pump 2 is connected to the decoupling reversing valve 4 through the third pipeline P3 in one way, and connected to the clutch through the fourth pipeline P4 in the other way.

[0046] In this embodiment, the first oil pump 1 is used to pump the oil to the cooler 3 and then transport the oil to the generator E1, the motor E2 and the clutch through pipelines after being cooled by the cooler 3.

[0047] Among them, when the hybrid vehicle is working, it has three working modes: pure electric drive mode, extended-range drive mode and hybrid drive mode. The first pilot solenoid valve 5 is used to control the decoupling commutator to perform reversing according to the current vehicle operation mode of the hybrid vehicle to achieve decoupling and coupling of the cooling lubricating oil circuit and the clutch control oil circuit; in the pure electric drive mode and the extended-range drive mode, the cooling lubricating oil circuit and the clutch control oil circuit are coupled, and in the hybrid drive mode, the cooling lubricating oil circuit and the clutch control oil circuit are decoupled.

[0048] The second oil pump 2 is used to pump the oil to the cooler 3 through the cooling lubricating oil circuit during coupling or to pump the oil to the clutch through the clutch control oil circuit during decoupling to drive the clutch to engage by using oil pressure.

[0049] Specifically, in the prior art, in the pure electric mode of the hybrid electric vehicle, only the low-pressure oil pump provides oil for the cooling lubricating oil circuit, and the high-pressure oil pump does not work, which places high requirements on the working of the low-pressure oil pump, and is easy to cause damage to the low-pressure oil pump. At the same time, the efficiency of the high-pressure oil pump is not fully utilized. The control system described in this embodiment is provided with a decoupling reversing valve 4, and the decoupling reversing valve 4 is controlled by the first pilot solenoid valve 5 to change direction, so as to achieve the coupling or decoupling of the cooling lubricating oil circuit and the clutch control oil circuit, that is, the cooling lubricating oil circuit and the clutch control oil circuit are connected or disconnected, and coupled in the pure electric or extended range mode, so that the oil volume at the oil outlet of the second oil pump 2 on the high-pressure side can be delivered to the cooler 3 for cooling in the pure electric or extended range mode, and then delivered to the generator E1, the motor E2 and the clutch E3. That is to say, in the pure electric mode of the hybrid electric vehicle, the high-pressure oil pump and the low-pressure oil pump work together, thereby reducing the requirements for the low-pressure oil pump, greatly improving the service life of the hydraulic system and the transmission efficiency of the whole machine, and reducing the layout space and production cost of the electromechanical coupler under the same performance.

[0050] In some embodiments, the first oil pump 1 is an electronic oil pump, and the cooling lubricating oil circuit further includes a first one-way valve 6 disposed on the first pipeline P1. The first one-way valve 6 is used to prevent the oil flowing out of the oil outlet of the electronic oil pump from flowing in reverse.

[0051] In some embodiments, the second oil pump 2 is a mechanical oil pump, the clutch control oil circuit further includes a second one-way valve 7 disposed on the third pipeline P3, and the third pipeline P3 is connected to the fourth pipeline P4. The second one-way valve 7 is used to prevent the oil flowing out of the oil outlet of the mechanical oil pump from flowing in reverse.

[0052] In some embodiments, the cooling lubricating oil circuit also includes a cooling flow control valve 8 disposed between the generator E1 and the cooler 3, and the cooling flow control valve 8 is also connected to the pipeline between the second oil pump 2 and the second one-way valve 7 through a fifth pipeline P5.

[0053] In some embodiments, the clutch control oil circuit also includes a clutch reversing valve 9, and a second pilot solenoid valve 10 respectively connected to the controller, one or more pressure sensors, a control oil circuit pressure reducing valve 13 and a main oil circuit regulating valve 14; the clutch reversing valve 9 is arranged on the fourth pipeline P4; the clutch reversing valve 9 is also connected to the second pilot solenoid valve 10 through a pipeline, and the second pilot solenoid valve 10 is also connected to the first pilot solenoid valve 5 through the sixth pipeline P6 and connected to the control oil circuit pressure reducing valve 13 through the seventh pipeline P7, and the sixth pipeline P6 and the seventh pipeline P7 are connected; the control oil circuit pressure reducing valve 13 is also connected to the third pipeline P3 through the eighth pipeline P8, and a pipeline is led out from the eighth pipeline P8 to connect the main oil circuit regulating valve 14, and the main oil circuit regulating valve 14 is also connected to the second pipeline P2 through the ninth pipeline P9; the one or more pressure sensors are arranged on the pipeline of the clutch control oil circuit.

[0054] Specifically, the pressure sensor is used to detect the pressure data of the clutch control oil circuit and transmit the pressure data to the controller. The controller controls the operation of the control oil circuit pressure reducing valve 13 and the main oil circuit regulating valve 14 according to the pressure data and a preset control strategy.

[0055] In this embodiment, the high-pressure second oil pump 2 is connected to the cooling flow valve through a pipeline, and the cooling flow valve is directly controlled by the oil pressure signal at the outlet of the high-pressure second oil pump 2. Compared with the prior art, this embodiment reduces a pilot solenoid valve, which greatly reduces the layout space and production cost of the electromechanical coupler under the same performance.

[0056] In some embodiments, the clutch control oil circuit includes a first pressure sensor 11 and a second pressure sensor 12. The first pressure sensor 11 is arranged on the fourth pipeline P4 near the clutch, and is used to detect the pipeline oil pressure near the clutch position. The second pressure sensor 12 is arranged on the eighth pipeline P8 near the main oil pressure regulating valve, and is used to detect the pipeline oil pressure at the corresponding position of the main oil pressure regulating valve.

[0057] In some embodiments, a relief valve 15 connected to the controller is provided on the first pipeline P1, and the relief valve 15 is used to adjust the pressure of the cooling and lubricating oil circuit to ensure the pressure difference of each oil outlet connecting the generator E1, the motor E2 and the clutch. In addition, the relief valve 15 in this embodiment can be vertically installed on the hydraulic module, which greatly reduces the layout space and production cost of the electromechanical coupler under the same performance.

[0058] In some embodiments, the eighth pipeline P8 is also provided with a safety valve 16, i.e., a pressure relief valve, which is connected to the controller. The safety valve 16 is used to relieve pressure when the pressure of the clutch control oil circuit exceeds a preset threshold, thereby limiting the maximum pressure of the clutch control oil circuit to improve the safety of the clutch control oil circuit.

[0059] like Figure 2 A control method of the electromechanical coupler hydraulic control system as described in the first embodiment is shown in the second embodiment of the present invention, and the method comprises the following steps:

[0060] S100 obtains the current operating mode of the vehicle.

[0061] The operation mode of the hybrid vehicle is obtained through the VCU control system. Whether the clutch needs to be engaged is determined by the vehicle's operation mode. When the vehicle obtains the VCU instruction to be in pure electric or extended range operation mode, it is determined that the clutch does not need to be engaged. When the vehicle obtains the VCU instruction to be in hybrid operation mode, it is determined that the clutch needs to be engaged.

[0062] S200 If the current operating mode of the vehicle is pure electric or extended-range mode, the controller controls the first pilot solenoid valve 5 to lose power and drive the decoupling reversing valve core to be in the right position normal working state, the cooling lubricating oil circuit and the clutch control oil circuit are coupled, the clutch control oil circuit and the cooling lubricating oil circuit are connected, the oil output by the first oil pump 1 is sent to the cooler 3 for cooling and then sent to the generator E1, the motor E2 and the clutch, the oil output by the second oil pump 2 enters the cooler 3 through the decoupling valve for cooling and then is sent to the generator E1, the motor E2 and the clutch.

[0063] Specifically, the flow of the second oil pump 2 flows into the clutch control oil circuit through the second one-way valve 7. Since the valve core of the decoupling reversing valve 4 is in the right working state at this time, most of the oil flow from the second oil pump 2 directly enters the cooling and lubricating oil circuit through the decoupling reversing valve 4, and is coupled with the flow of the first oil pump 1 to provide oil flow to the cooling and lubricating oil circuit, thereby greatly reducing the demand for the low-pressure electronic pump flow and increasing the service life of the first oil pump 1.

[0064] It should be noted that the decoupling of the hydraulic control system entering the cooling lubricating oil circuit and the clutch control oil circuit should be after the clutch is disengaged to reduce the impact caused by pressure fluctuations.

[0065] S300 If the current operating mode of the vehicle is the hybrid mode, the controller controls the first pilot solenoid valve 5 to be electrically driven to drive the decoupling reversing valve core to be in the left position working normal state, the cooling lubricating oil circuit and the clutch control oil circuit are decoupled, the clutch control oil circuit and the cooling lubricating oil circuit are not connected, the oil output by the first oil pump 1 is sent to the cooler 3 for cooling and then sent to the generator E1, the motor E2 and the clutch, and the oil output by the second oil pump 2 is sent to the clutch through the decoupling valve and the clutch control oil circuit in sequence.

[0066] Specifically, the oil flow of the first oil pump 1 still flows directly into the cooling and lubrication oil circuit to provide the flow required for cooling and lubrication. After the oil flow of the second oil pump 2 enters the clutch control oil circuit through the second one-way valve 7, the decoupling reversing valve 4 is closed, thereby establishing high pressure in the clutch control oil circuit, and the input flow is preferentially supplied to the clutch engagement.

[0067] It should be noted that the decoupling of the cooling lubricating oil circuit and the clutch control oil circuit should be done within a set time before the clutch starts to engage, to ensure that the main oil pressure of the clutch control oil circuit has been established when the clutch engages.

[0068] In some embodiments, if the current operating mode of the vehicle is the hybrid mode, the S300 further includes the following steps:

[0069] The second pilot solenoid valve 10 controls the clutch reversing valve 9 to open, and the oil output by the second oil pump 2 is sent to the clutch in sequence through the decoupling valve, the clutch reversing valve 9 and the clutch control oil circuit, wherein the pressure sensor detects the pressure parameter of the clutch control oil circuit in real time, and when the pressure parameter is greater than a preset value, the excess oil in the clutch control oil circuit flows out through the main oil circuit regulating valve 14 and merges into the cooling lubrication oil circuit.

[0070] In some embodiments, the S300 further includes the following step: if the current operating mode of the vehicle is a hybrid mode, increasing the oil flow rate of the cooling lubrication oil circuit during the clutch engagement time.

[0071] Specifically, the speed of the low-pressure first oil pump 1 motor is determined according to the mode of the hydraulic control system, that is, when it is in the coupling mode, the clutch is disengaged, and the first oil pump 1 and the second oil pump 2 simultaneously provide oil flow to the cooling and lubricating oil circuit; when it is in the decoupling mode, the clutch is engaged, and at this time it is mainly the first oil pump 1 that provides oil flow to the cooling and lubricating oil circuit. Therefore, it is necessary to increase the speed of the low-pressure first oil pump 1 motor to increase the oil flow of the cooling and lubricating oil circuit during the clutch engagement time.

[0072] In some embodiments, the method further includes the following steps: if the current vehicle is in pure electric mode, closing the cooling flow control valve 8; if the current vehicle is in extended-range or hybrid mode, opening the cooling flow control valve 8.

[0073] Specifically, when the hydraulic control system is in the pure electric working mode, the generator E1 does not need to operate, the cooling flow control valve 8 is in a closed state, and no cooling and lubrication flow is provided to the generator E1. The flow is used for cooling and lubrication of the drive motor and the clutch, thereby improving the efficiency of the system. When the hydraulic control system is in the extended range or hybrid driving mode, the generator E1 needs to operate, and the oil pressure from the second oil pump 2 can open the cooling flow control valve 8, so that the generator E1 can obtain the distributed flow from the cooling and lubrication oil circuit.

[0074] For the method embodiments disclosed in the embodiments, since they correspond to the systems disclosed in the embodiments, the relevant parts that are not described in detail can be referred to the system part description.

[0075] In the description of this specification, the description of reference terms such as "some embodiments" means that the specific features described in conjunction with the embodiments or examples are included in at least one embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment. Moreover, the specific features described can be combined in any one or more embodiments in a suitable manner.

[0076] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electromechanical coupler hydraulic control system, characterized in that: It includes a first oil pump, a second oil pump, a controller, a cooling and lubricating oil circuit, a clutch control oil circuit and a pilot control oil circuit; The cooling lubricating oil circuit includes a plurality of pipelines and a cooler, the oil inlet of the cooler is connected to the first oil pump through a first pipeline, and the oil outlet of the cooler is connected to the generator, the motor and the clutch through pipelines respectively; The first oil pump and the second oil pump are respectively connected to the oil tank; The pilot control oil circuit includes a decoupling reversing valve and a first pilot solenoid valve connected by a pipeline, and the decoupling reversing valve is connected to the cooler through a second pipeline; The clutch control oil circuit includes a third pipeline and a fourth pipeline; the oil outlet of the second oil pump is connected to the decoupling reversing valve through the third pipeline in one way, and connected to the clutch through the fourth pipeline in the other way; The controller is connected to the first oil pump, the second oil pump and the first pilot solenoid valve respectively; The first oil pump is used to pump the oil to the cooler and transport the oil to the generator, motor and clutch through pipelines after being cooled by the cooler; the controller is used to control the first pilot solenoid valve to drive the decoupling reversing valve to reverse according to the current vehicle operation mode to achieve decoupling and coupling of the cooling lubricating oil circuit and the clutch control oil circuit; the second oil pump is used to pump the oil to the cooler through the cooling lubricating oil circuit when coupling or to pump the oil to the clutch through the clutch control oil circuit when decoupling.

2. The electromechanical coupler hydraulic control system according to claim 1, characterized in that: The first oil pump is an electronic oil pump, and the cooling and lubricating oil circuit further includes a first one-way valve arranged on the first pipeline.

3. The electromechanical coupler hydraulic control system according to claim 2, characterized in that: The second oil pump is a mechanical oil pump, the clutch control oil circuit further includes a second one-way valve arranged on the third pipeline, and the third pipeline is connected to the fourth pipeline.

4. The electromechanical coupler hydraulic control system according to claim 3, characterized in that: The cooling lubricating oil circuit also includes a cooling flow control valve disposed between the generator and the cooler. The cooling flow control valve is also connected to the pipeline between the second oil pump and the second one-way valve through a fifth pipeline.

5. The electromechanical coupler hydraulic control system according to claim 4, characterized in that: The clutch control oil circuit also includes a clutch reversing valve, and a second pilot solenoid valve, one or more pressure sensors, a control oil circuit pressure reducing valve and a main oil circuit regulating valve respectively connected to the controller; The clutch reversing valve is arranged on the fourth pipeline; the clutch reversing valve is also connected to the second pilot solenoid valve through a pipeline, and the second pilot solenoid valve is also connected to the first pilot solenoid valve through a sixth pipeline and to the control oil circuit pressure reducing valve through a seventh pipeline, and the sixth pipeline and the seventh pipeline are connected; the control oil circuit pressure reducing valve is also connected to the third pipeline through an eighth pipeline, and a pipeline is led out from the eighth pipeline to connect the main oil circuit regulating valve, and the main oil circuit regulating valve is also connected to the second pipeline through a ninth pipeline; the one or more pressure sensors are arranged on the pipeline of the clutch control oil circuit.

6. The electromechanical coupler hydraulic control system according to claim 5, characterized in that: The clutch control oil circuit includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is disposed on the fourth pipeline and the second pressure sensor is disposed on the eighth pipeline.

7. The electromechanical coupler hydraulic control system according to any one of claims 1 to 6, characterized in that: The first pipeline is provided with an overflow valve connected to the controller, and the overflow valve is used to adjust the pressure of the cooling lubricating oil circuit.

8. The electromechanical coupler hydraulic control system according to any one of claims 5 to 6, characterized in that: The eighth pipeline is also provided with a safety valve connected to the controller, and the safety valve is used to release pressure when the oil pressure of the clutch control oil circuit exceeds a preset threshold.

9. A control method for an electromechanical coupling hydraulic control system as claimed in claim 1, comprising the following steps: Get the current operating mode of the vehicle; If the current running mode of the vehicle is pure electric or extended range mode, the controller controls the first pilot solenoid valve to lose power and drive the decoupling reversing valve spool to be in the right position normal working state, the cooling lubricating oil circuit and the clutch control oil circuit are coupled, the oil output by the first oil pump is sent to the cooler for cooling and then sent to the generator, motor and clutch, and the oil output by the second oil pump enters the cooler through the decoupling reversing valve for cooling and then sent to the generator, motor and clutch; If the current operating mode of the vehicle is the hybrid mode, the controller controls the first pilot solenoid valve to be energized to drive the decoupling reversing valve core to be in the left position normal working state, the cooling lubrication oil circuit and the clutch control oil circuit are decoupled, the oil output by the first oil pump is sent to the cooler for cooling and then to the generator, motor and clutch, and the oil output by the second oil pump is sent to the clutch via the decoupling reversing valve and the clutch control oil circuit in sequence.

10. A control method for an electromechanical coupler hydraulic control system as claimed in claim 5, comprising the following steps: Get the current operating mode of the vehicle; If the current running mode of the vehicle is pure electric or extended range mode, the controller controls the first pilot solenoid valve to lose power and drive the decoupling reversing valve spool to be in the right position normal working state, the cooling lubricating oil circuit and the clutch control oil circuit are coupled, the oil output by the first oil pump is sent to the cooler for cooling and then sent to the generator, motor and clutch, and the oil output by the second oil pump enters the cooler through the decoupling reversing valve for cooling and then sent to the generator, motor and clutch; If the current operating mode of the vehicle is the hybrid mode, the controller controls the first pilot solenoid valve to be energized to drive the decoupling reversing valve spool to be in the left position working state, the cooling lubrication oil circuit and the clutch control oil circuit are decoupled, and the oil output by the first oil pump is sent to the cooler for cooling and then sent to the generator, motor and clutch; the controller controls the second pilot solenoid valve to drive the clutch reversing valve to open, and the oil output by the second oil pump is sent to the clutch in sequence through the decoupling reversing valve, the clutch reversing valve and the corresponding pipelines; wherein, The pressure sensor detects the pressure parameter of the clutch control oil circuit in real time. When the pressure parameter is greater than a preset value, excess oil in the clutch control oil circuit flows out through the main oil circuit regulating valve and merges into the cooling lubricating oil circuit.

11. The control method according to claim 9 or 10, characterized in that: The method also includes the following steps: if the current operating mode of the vehicle is the hybrid mode, increasing the oil flow rate of the cooling lubrication oil circuit during the clutch engagement time.

12. The control method according to claim 10, characterized in that: It also includes the following steps: if the current vehicle is in pure electric mode, closing the cooling flow control valve; if the current vehicle is in extended-range or hybrid mode, opening the cooling flow control valve.

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